Unit 3 Test True/False Practice

A mixture is composed of elements or compounds that have been chemically joined.

• True

• False

Chemists say that a substance is pure when it contains only one element or compound.

• True

• False

Water is a good solvent because it is a polar molecule.

• True

• False

Tags

NGSS.HS-PS1-3

The solubility of a solid increases as the temperature increases. The solubility of a gas decreases as the temperature increases.

• True

• False

Tags

NGSS.MS-PS1-4

Evaporation is the easiest method for separating a suspension.

• True

• False

Distillation is a method of separating a mixture that is best used when you need to separate the solvent from the solution.

• True

• False

An electrode is a piece of metal or graphite that allows the electrical current to flow into the electrolyte

• True

• False

Tags

NGSS.HS-PS3-5

Electrorefining is the process of using electrolysis to purify a metal, such as copper.

• True

• False